Question

A number is thrice another number.If their sum is 20, what are the numbers?

Answer 1

Answer:

Let the number be x

and another number be 3x

x+3x =20

4x=20

x=20/4

x=5

The numbers are

5 and 15

Answer 2

Answer:y=5and x=15

Step-by-step explanation:

Let the no. Be x and y

A/q,

x=3y and

X+y=20

Put value of x in 2 we get

3y+y=20

4y=20

Y=5

And put value of y in 1

X=3y

X=3×5

X=15